Abstract: Based on the problems of long convergence time and low precision of low cost single receivers caused by the ionospheric delay errors.The author proceses first to establish a high precision Satellite-specific Epoch-differenced Ionospheric Delay model with dual frequency observation information of the area,then single frequency observations inversion to dual frequency observations and can make ionosphere free positioning solution,Finally,get dual frequency solution model of single frequency PPP.Though analyzing the numerical example with real data,the new method in this essay markedly improves the converging speed and positioning accuracy of single-PPP,and its positioning precision is approximately equal to dual frequency accuracy.